components: Cleanup class/struct fwd declarations

components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_AUTH_REQUEST_HANDLER_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_AUTH_REQUEST_HANDLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_util.h"
 
 namespace net {
-class HostPortPair;
 class HttpRequestHeaders;
-class HttpResponseHeaders;
-class ProxyServer;
-class URLRequest;
 }
 
 namespace data_reduction_proxy {
 
 extern const char kSessionHeaderOption[];
 extern const char kCredentialsHeaderOption[];
 extern const char kSecureSessionHeaderOption[];
 extern const char kBuildNumberHeaderOption[];
 extern const char kPatchNumberHeaderOption[];
 extern const char kClientHeaderOption[];
@@ skipping 115 matching lines @@
   DataReductionProxyConfig* data_reduction_proxy_config_;
 
   // Enforce usage on the IO thread.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyRequestOptions);
 };
 
 }  // namespace data_reduction_proxy
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_AUTH_REQUEST_HANDLER_H_